I use the Mequires paste wax but not until after at least 90 days. But right after the power compound, Mirror glaze #7, on yeah, there is nothing like Mirror glaze for the best finish in my opinion.
Getting back to the air tools, I do use a "DA" an old DAQ ND for metal finishing (using no filler). And an nice "Orbital" Dynabrade like you would for cutting clear to buff, but I don't use it for that. It actually isn't as tight a revolution as they have now but when I bought it, it was THE thing. I still use it for a number of uses. On the "in line" air sander, damn if I haven't owned one since I was about 17! No kidding, I traded off my air board for an air chisel that I still have today. I lived without one for darn near 20 years until I used a Hutchens 3800 and had to own one. For large panels it is a nice tool to get you close enough to block by hand. It's an orbital sander, not an inline.